sql-statement-drop-stats.md

title	summary	aliases
DROP STATS	TiDB 数据库中 DROP STATS 的使用概况。	/docs-cn/dev/sql-statements/sql-statement-drop-stats/

DROP STATS

DROP STATS 语句用于从当前所选定的数据库中删除选定表的统计信息。

语法图

DropStatsStmt ::=
    'DROP' 'STATS' TableNameList 

TableNameList ::=
    TableName ( ',' TableName )*

TableName ::=
    Identifier ('.' Identifier)?

示例

{{< copyable "sql" >}}

CREATE TABLE t(a INT);

Query OK, 0 rows affected (0.01 sec)

{{< copyable "sql" >}}

SHOW STATS_META WHERE db_name='test' and table_name='t';

+---------+------------+----------------+---------------------+--------------+-----------+
| Db_name | Table_name | Partition_name | Update_time         | Modify_count | Row_count |
+---------+------------+----------------+---------------------+--------------+-----------+
| test    | t          |                | 2020-05-25 20:34:33 |            0 |         0 |
+---------+------------+----------------+---------------------+--------------+-----------+
1 row in set (0.00 sec)

{{< copyable "sql" >}}

DROP STATS t;

Query OK, 0 rows affected (0.00 sec)

{{< copyable "sql" >}}

SHOW STATS_META WHERE db_name='test' and table_name='t';

Empty set (0.00 sec)

MySQL 兼容性

该语句是 TiDB 对 MySQL 语法的扩展。

另请参阅

• 统计信息简介